Improve error logging for PluginFactory

} catch (InvocationTargetException e)

{ message = e.getTargetException().getClass().getName() + ": " + e.getTargetException().getMessage(); log.error(e.getMessage()); e.printStackTrace(); }

catch (Exception e)

{ message = e.getClass().getName() + ": " + e.getMessage(); log.error(e.getMessage()); e.printStackTrace(); }

Maybe something like:
} catch (Exception e)

{ log.error(message); log.debug(message,e); }